make it respect the fps setting

app.py

@@ -283,12 +283,12 @@ def main(file, name, fps=30, res: tuple=(1280,720), oscres=512, sr=11025, lyrics
     if haslyrics:
         ffmpeg_cmd = [
             "ffmpeg",
-            '-framerate', '30',
+            '-framerate', str(fps),
             '-i', path + f'out/{name}/%d.png',  # Input PNG images
             '-i', file,  # Input MP3 audio
             '-i', path + 'out.srt',  # Input SRT subtitles
             '-c:v', 'libx264',
-            '-r', '30',
+            '-r', str(fps),
             '-pix_fmt', 'yuv420p',
             '-c:a', 'aac',
             '-c:s', 'mov_text',  # Use mov_text codec for subtitles
@@ -298,11 +298,11 @@ def main(file, name, fps=30, res: tuple=(1280,720), oscres=512, sr=11025, lyrics
     else:
         ffmpeg_cmd = [
             "ffmpeg",
-            '-framerate', '30',
+            '-framerate', str(fps),
             '-i', path + f'out/{name}/%d.png',  # Input PNG images
             '-i', f'{file}',  # Input MP3 audio
             '-c:v', 'libx264',
-            '-r', '30',
+            '-r', str(fps),
             '-pix_fmt', 'yuv420p',
             '-c:a', 'aac', 
             '-y',